or whis·tle blow·er
Origin of whistle-blower
Related formswhis·tle-blow·ing, noun
Examples from the Web for whistle-blower
That tells us he may have been more than just a “whistle-blower.”
The difference between a leaker and a whistle-blower is important.Obama Is Right to Prosecute Leakers Who Are Not the Same as Whistle-Blowers|Matthew Miller|March 10, 2012|DAILY BEAST
What do an Israeli soldier, a Houston whistle-blower, and a Swiss border-patrol officer have in common?
“I was amazed at how terrifying it would be to be a whistle-blower,” he says.Panetta, Gates, Rumsfeld Face New Suit Over U.S. Military Rape ‘Epidemic’|Jesse Ellison|March 6, 2012|DAILY BEAST